gistfile1.txt

class string_impl
{
    struct table
    {
        std::uint32_t size;
        std::uint32_t capacity;
    };

    struct sbo
    {
        kind k;
        char buf[
            2*sizeof(table*)-sizeof(kind)];
    };

    struct pointer
    {
        kind k;
        char pad[
            sizeof(table*)-sizeof(kind)];
        table* t;
    };

    union
    {
        sbo s_;
        pointer p_;
    };